What the shit this was? Introduce childhood friend before, who lives in Tatsu's hometown, and now, suddenly, after this, she just casually walks into their house, where door is opened just like that, saying "oh, we didn't see each other in years but what a coincidence, I go to the uni near by, you didn't know? Well, who cares, I just gonna sleep in your house".
What the fuck?! This whole situation makes me mad, I meen, I know, that this is a sitcom, but author didn't even try to follow some logic or rules of his own manga, he just do whatever is convenient for him, and this kind of shitty writing pisses me off 🤬